I drink a lot of fizzy water, probably about two litres a day. Is fizzy water as good for you as normal still water, and is there anything bad that so much fizzy could be doing to me?The only side-effect of drinking so much fizzy water that I can think of is that you may find yourself belching a lot. However, that aside, I am concerned that you are drinking two litres of water every day, fizzy or not. The old idea that people should be drinking litres of water a day, apart from their regular food, was put in severe doubt a year or two ago. Our current thinking is that you should drink only when you feel thirsty, and not force yourself to take in more fluid than your body needs. Drinking water to excess may disturb your body's fluid balance, and in the long run it may not be the best thing for your kidneys. The fact that there are bubbles of carbon dioxide in the water you drink is neither here nor there.